X Ray Tetra (Pristella maxillaris)
X Ray Tetras are from the coastal waters of the river Amazon, and are silvery yellow in colour, with a translucent quality which means their backbones can be seen through their skin. They have red-tipped tails and striped dorsal and anal fins that are yellow, black and white. Like other tetras, they can live happily in soft fresh water, but because of their coastal origins can also, unlike most other tetras, tolerate harder brackish water. They are a shoaling fish that prefer to live in groups of six or more fish of the same species.
X Ray Tetras will sometimes breed in an aquarium setting, so you may need a hospital tank to look after fry. When ready to breed, the eggs will be clearly visible inside the female, owing to her semi see-through skin. Eggs will begin to hatch 24 hours after being scattered, but fry will be eaten by the parents (or other tank-mates) unless they are removed and housed elsewhere until big enough to survive.
X Ray Tetra will eat tropical flake food, and also brine shrimp, daphnia, freeze dried bloodworms and tubifex, and micro pellet food.
Size (fully grown): 3 – 5cm (1.5 – 2″)
Water temperature: 22 – 27C
Water pH: 5.8 – 8.5 (optimum 6 – 7.5)